diff --git a/client/src/lib/luxsinApi.ts b/client/src/lib/luxsinApi.ts
index 7a196a3..7779a05 100644
--- a/client/src/lib/luxsinApi.ts
+++ b/client/src/lib/luxsinApi.ts
@@ -171,6 +171,9 @@ export interface PeqApplyPayload {
 export const INPUT_LABELS = ["USB", "USB-C", "Coaxial", "Optical", "Bluetooth", "IIS", "RCA"];
 export const OUTPUT_LABELS = ["XLR", "RCA", "Headset", "XLR/RCA"];
 
+/** Device `input` index for Bluetooth source. */
+export const INPUT_BLUETOOTH_INDEX = 4;
+
 /** Device `output` index for headphone / headset. */
 export const OUTPUT_HEADSET_INDEX = 2;
 export const LANGUAGE_LABELS = ["English", "繁體中文", "简体中文"];
@@ -345,6 +348,19 @@ export function parseFirmwareVersion(version: unknown): number {
   return Number(parts[parts.length - 1]);
 }
 
+/** Display firmware version as X.Y.0.Z (e.g. 2005 → 2.0.0.5). */
+export function formatFirmwareVersionDisplay(version: unknown): string {
+  if (version === null || version === undefined || String(version).trim() === "") {
+    return "—";
+  }
+  const n = parseFirmwareVersion(version);
+  const major = Math.floor(n / 1000);
+  const minor = Math.floor((n % 1000) / 100);
+  const patch = 0;
+  const build = n % 10;
+  return `${major}.${minor}.${patch}.${build}`;
+}
+
 /** Pre-out volume passthrough mode selected (0dB or -12dB). */
 export function isVolumePassthroughActive(dacVolumeDirect: number | undefined): boolean {
   return dacVolumeDirect === 1 || dacVolumeDirect === 2;
diff --git a/client/src/locales/data-en.json b/client/src/locales/data-en.json
index 5aa8f79..3a43054 100644
--- a/client/src/locales/data-en.json
+++ b/client/src/locales/data-en.json
@@ -404,11 +404,11 @@
         },
         {
           "index": 4,
-          "label": "De-emphasis filter"
+          "label": "Super Slow Roll-off"
         },
         {
           "index": 5,
-          "label": "Non-oversampling"
+          "label": "Low Dispersion Short Delay"
         }
       ]
     },
diff --git a/client/src/locales/data-zh-HK.json b/client/src/locales/data-zh-HK.json
index 7ce6fea..563fb50 100644
--- a/client/src/locales/data-zh-HK.json
+++ b/client/src/locales/data-zh-HK.json
@@ -326,8 +326,8 @@
         { "index": 1, "label": "慢速衰減" },
         { "index": 2, "label": "短延遲快速衰減" },
         { "index": 3, "label": "短延遲慢速衰減" },
-        { "index": 4, "label": "去重強調" },
-        { "index": 5, "label": "非過采樣（NOS）" }
+        { "index": 4, "label": "超慢速滾降" },
+        { "index": 5, "label": "低離散短延遲" }
       ]
     },
     "dacGain": {
diff --git a/client/src/locales/data-zh.json b/client/src/locales/data-zh.json
index b01249e..6afa824 100644
--- a/client/src/locales/data-zh.json
+++ b/client/src/locales/data-zh.json
@@ -326,8 +326,8 @@
         { "index": 1, "label": "慢速滚降" },
         { "index": 2, "label": "短延迟快速滚降" },
         { "index": 3, "label": "短延迟慢速滚降" },
-        { "index": 4, "label": "去重强调" },
-        { "index": 5, "label": "非过采样（NOS）" }
+        { "index": 4, "label": "超慢速滚降" },
+        { "index": 5, "label": "低离散短延迟" }
       ]
     },
     "dacGain": {
diff --git a/client/src/pages/AudioPage.tsx b/client/src/pages/AudioPage.tsx
index 62837da..ea503c3 100644
--- a/client/src/pages/AudioPage.tsx
+++ b/client/src/pages/AudioPage.tsx
@@ -235,7 +235,7 @@ export default function AudioPage() {
   const bootSoundSelectIdx = Math.min(bootSoundVal, bootSoundMaxIdx);
   const BOOT_VOLUME_OPTIONS = bootVolumeOptions(dacText, bootSoundMaxIdx);
 
-  const FILTER_OPTIONS = optionLabels(dacText.filters?.options, ["快速滚降", "慢速滚降", "短延迟快速滚降", "短延迟慢速滚降", "去重强调", "非过采样（NOS）"]);
+  const FILTER_OPTIONS = optionLabels(dacText.filters?.options, ["快速滚降", "慢速滚降", "短延迟快速滚降", "短延迟慢速滚降", "超慢速滚降", "低离散短延迟"]);
   const GAIN_OPTIONS = optionLabels(dacText.dacGain?.options, ["低", "中", "高"]);
   const DAC_VOLUME_DIRECT_OPTIONS = optionLabels(dacText.dacVolumeDirect?.options, ["关闭", "0dB", "-12dB"]);
   const DAC_ARC_OPTIONS = optionLabels(dacText.dacArc?.options, ["ARC", "EARC"]);
diff --git a/client/src/pages/EffectsPage.tsx b/client/src/pages/EffectsPage.tsx
index e823a42..6f2b26f 100644
--- a/client/src/pages/EffectsPage.tsx
+++ b/client/src/pages/EffectsPage.tsx
@@ -144,27 +144,31 @@ function IOSToggle({ checked, onChange }: { checked: boolean; onChange: (v: bool
   );
 }
 
-function CyanSlider({ value, min, max, step = 0.1, onChange, onRelease }: {
+function CyanSlider({ value, min, max, step = 0.1, disabled = false, onChange, onRelease }: {
   value: number;
   min: number;
   max: number;
   step?: number;
+  disabled?: boolean;
   onChange: (v: number) => void;
   /** Fires once when the user releases the thumb (pointer/mouse/touch). Read value from DOM to avoid stale React state. */
   onRelease?: (v: number) => void;
 }) {
   const fillPct = ((value - min) / (max - min)) * 100;
   const emitRelease = (el: EventTarget | null) => {
-    if (!(el instanceof HTMLInputElement)) return;
+    if (disabled || !(el instanceof HTMLInputElement)) return;
     onRelease?.(Number(el.value));
   };
   return (
-    <div className="relative flex items-center w-full mt-3">
+    <div className={`relative flex items-center w-full mt-3 ${disabled ? "opacity-50 pointer-events-none" : ""}`}>
       <div className="absolute left-0 h-[4px] rounded-full pointer-events-none"
         style={{ width: `${fillPct}%`, background: "#00FFF6", boxShadow: "0 0 6px rgba(0,255,246,0.5)" }} />
-      <input type="range" min={min} max={max} step={step} value={value}
+      <input type="range" min={min} max={max} step={step} value={value} disabled={disabled}
         className="cyan-slider relative z-10"
-        onChange={(e) => onChange(Number(e.target.value))}
+        onChange={(e) => {
+          if (disabled) return;
+          onChange(Number(e.target.value));
+        }}
         onPointerUp={(e) => emitRelease(e.currentTarget)}
         onPointerCancel={(e) => emitRelease(e.currentTarget)}
         onKeyUp={(e) => {
@@ -359,8 +363,16 @@ export default function EffectsPage() {
             <IOSToggle checked={sceneOn} onChange={(v) => updateSetting({ effect_enable: v ? 1 : 0 })} />
           </div>
           <button
-            className="flex items-center justify-between w-full active:opacity-70 transition-opacity"
-            onClick={() => goSelect(effectText.selectStyleTitle, sceneLabels, sceneVal, "effect_value")}>
+            type="button"
+            disabled={!sceneOn}
+            className={`flex items-center justify-between w-full transition-opacity ${
+              sceneOn ? "active:opacity-70" : "cursor-default opacity-50"
+            }`}
+            onClick={() => {
+              if (!sceneOn) return;
+              goSelect(effectText.selectStyleTitle, sceneLabels, sceneVal, "effect_value");
+            }}
+          >
             <span className="text-[15px] text-white/55">{sceneDisplay}</span>
             <ChevronRight size={16} className="ios-chevron" />
           </button>
@@ -380,16 +392,20 @@ export default function EffectsPage() {
             min={0}
             max={100}
             step={1}
+            disabled={!widthOn}
             onChange={(v) => {
+              if (!widthOn) return;
               isDragging.current = true;
               setLocalWidth(Math.round(v));
             }}
             onRelease={(v) => {
+              if (!widthOn) return;
               isDragging.current = false;
               const w = Math.round(v);
               setLocalWidth(w);
               updateSetting({ width_value: w });
-            }} />
+            }}
+          />
         </div>
 
         {/* ── 交叉反馈 ── */}
@@ -399,8 +415,16 @@ export default function EffectsPage() {
             <IOSToggle checked={crossfeedOn} onChange={(v) => updateSetting({ crossfeed_enable: v ? 1 : 0 })} />
           </div>
           <button
-            className="flex items-center justify-between w-full active:opacity-70 transition-opacity"
-            onClick={() => goSelect(effectText.selectCrossfeedTitle, crossfeedLabels, crossfeedVal, "crossfeed_value")}>
+            type="button"
+            disabled={!crossfeedOn}
+            className={`flex items-center justify-between w-full transition-opacity ${
+              crossfeedOn ? "active:opacity-70" : "cursor-default opacity-50"
+            }`}
+            onClick={() => {
+              if (!crossfeedOn) return;
+              goSelect(effectText.selectCrossfeedTitle, crossfeedLabels, crossfeedVal, "crossfeed_value");
+            }}
+          >
             <span className="text-[14px] text-white/45">{crossfeedDisplay}</span>
             <ChevronRight size={16} className="ios-chevron" />
           </button>
diff --git a/client/src/pages/Home.tsx b/client/src/pages/Home.tsx
index 03981ee..d2b1890 100644
--- a/client/src/pages/Home.tsx
+++ b/client/src/pages/Home.tsx
@@ -22,7 +22,12 @@ import {
   AlertDialogHeader,
   AlertDialogTitle,
 } from "@/components/ui/alert-dialog";
-import { INPUT_LABELS, isHomeVolumeLockedByPassthrough, OUTPUT_LABELS } from "@/lib/luxsinApi";
+import {
+  INPUT_BLUETOOTH_INDEX,
+  INPUT_LABELS,
+  isHomeVolumeLockedByPassthrough,
+  OUTPUT_LABELS,
+} from "@/lib/luxsinApi";
 import { cn } from "@/lib/utils";
 import {
   ChevronRight,
@@ -164,7 +169,7 @@ function ListRow({
 }
 
 export default function Home() {
-  const { isConnected, deviceState, setVolume, updateSetting, api, disconnect, isDemoMode, ip } = useDevice();
+  const { isConnected, deviceState, setVolume, updateSetting, api, isDemoMode, ip } = useDevice();
   const [, setLocation] = useLocation();
   const powerActionRef = useRef(false);
   const hpEqLastTapRef = useRef<number | null>(null);
@@ -232,24 +237,18 @@ export default function Home() {
     if (powerActionRef.current) return;
     powerActionRef.current = true;
     try {
-      if (isDemoMode) {
-        toast.info(homeText.powerOffToastDemo ?? "演示模式：已断开与设备的连接");
-        disconnect();
-        return;
-      }
-      if (api) {
+      if (!isDemoMode && api) {
         try {
           await api.powerOff();
         } catch {
-          // 设备可能已掉线或未返回响应，仍断开本地会话
+          // 设备关机后可能已无响应，仍保留当前页面与连接状态
         }
       }
-      disconnect();
       toast.success(homeText.powerOffToastSent ?? "已发送关机指令");
     } finally {
       powerActionRef.current = false;
     }
-  }, [api, disconnect, isDemoMode, homeText]);
+  }, [api, isDemoMode, homeText]);
 
   /** HP-EQ 圆钮：单击在短延迟后切换 peqEnable（避免与双击抢）；280ms 内第二次点击则取消开关并进入 /eq */
   const HP_EQ_DOUBLE_CLICK_MS = 280;
@@ -779,8 +778,8 @@ export default function Home() {
           </button>
         </div>
 
-        {/* Bluetooth info */}
-        {ds.bt_status !== 0 && (
+        {/* Bluetooth info — only when input source is Bluetooth */}
+        {ds.input === INPUT_BLUETOOTH_INDEX && ds.bt_status !== 0 && (
           <div className="mt-3 px-3 py-3 text-center">
             <div className="flex items-center justify-center gap-1.5 mb-1">
               <Bluetooth size={14} className="text-[#00FFF6]" />
diff --git a/client/src/pages/SystemPage.tsx b/client/src/pages/SystemPage.tsx
index 5a033cf..8787390 100644
--- a/client/src/pages/SystemPage.tsx
+++ b/client/src/pages/SystemPage.tsx
@@ -13,6 +13,7 @@ import { ChevronLeft, ChevronRight } from "lucide-react";
 import { useLocation } from "wouter";
 import { useEffect } from "react";
 import BottomNav from "@/components/BottomNav";
+import { formatFirmwareVersionDisplay } from "@/lib/luxsinApi";
 import { navigateToSelect } from "./SelectPage";
 import localeZh from "@/locales/data-zh.json";
 import localeZhHK from "@/locales/data-zh-HK.json";
@@ -215,7 +216,7 @@ export default function SystemPage() {
           </div>
           <div className="ios-list-row">
             <span className="flex-1 text-[16px] text-white">{ui.firmwareVersion}</span>
-            <span className="ios-row-value">{ds?.version ?? "—"}</span>
+            <span className="ios-row-value">{formatFirmwareVersionDisplay(ds?.version)}</span>
           </div>
           <div className="ios-list-row">
             <span className="flex-1 text-[16px] text-white">{ui.macAddress}</span>